Using
additional simulations with each GVM in which the CO2 experienced by the vegetation was held constant, these results were further analyzed by fitting to each GVM
globally, a simple two - parameter
model for the relationship between NPP and CO2 [i.e.,, where is the change in CO2], combined with linear
models for the relationships between NPP and temperature (i.e., MLT) and residence time and temperature (i.e., MLT).
Recent
model results, by contrast, suggest that significant impacts will persist for hundreds of thousands of years after emissions cease;» Matthews and Caldeira (2008): «We show first that a single pulse of carbon released into the atmosphere increases
globally averaged surface temperature by an amount that remains approximately constant for several centuries, even in the absence of
additional emissions.»